Ardour crash after duplicating 194kB sample file

Hello everyone!
I need some help. Maybe your expirience tell me what to do.
I run 64Studio 2.1 Ardour 2.3 (rev.3029) AMD64 compilation.
I have a few sessions in Ardour, each has about 15 mono tracks and 7min long.
Not much plugins, just about five (MultibandEQ, SC4m, Gverb) in the hole session, and normalize on some tracks.

And here is the problem.

For exapmle:
Folder with one session has 720MB.
I load session and trying to add one bass drum kick sample file 194kB size and duplikate it.
After a few steps of duplicating I save with ctrl+s and duplicating again,
and after another few duplicates of file and the last ctrl+s, Ardour crash - system load very high, I think about 100%, I can see only graph on panel in IceWM.
All session crash and I'm back on desktop, jackd is still working.
I have to start session again.